Issue 8, 2020

Hierarchical porous carbon nanofibers for compatible anode and cathode of potassium-ion hybrid capacitor

Abstract

The development of electrode materials with the capability of balancing kinetics and capacity between a battery-type anode and capacitor-type cathode is still a grand challenge for potassium-ion hybrid capacitors (PIHCs). Herein, we report the design and synthesis of phosphorus/nitrogen co-doped hierarchical porous carbon nanofibers (PN-HPCNFs) that feature desirable one dimensional (1D) structure and favorable electrochemical properties for PIHC application. We demonstrated that the as-prepared PN-HPCNFs presented a highly attractive performance in terms of capacity or capacitance and durability as both the battery-type anode and capacitor-type cathode of PIHCs, which endows it with great potential for practical application in full PIHCs by delivering a high energy density of 191 W h kg−1 and a high power output of 7560 W kg−1 as well as an ultralong lifespan (82.3% capacity retention after 8000 cycles). Systematic characterization analysis and first-principle calculations demonstrated that the hierarchical pores in the 1D structure, heteroatom P/N co-doping, and enlarged interlayer graphite spacing in the APN-HPCNF contributed synergistically to the outstanding electrochemical performance of PIHCs.

Graphical abstract: Hierarchical porous carbon nanofibers for compatible anode and cathode of potassium-ion hybrid capacitor

Supplementary files

Article information

Article type
Paper
Submitted
13 фев. 2020
Accepted
25 мар. 2020
First published
25 мар. 2020

Energy Environ. Sci., 2020,13, 2431-2440

Hierarchical porous carbon nanofibers for compatible anode and cathode of potassium-ion hybrid capacitor

X. Hu, G. Zhong, J. Li, Y. Liu, J. Yuan, J. Chen, H. Zhan and Z. Wen, Energy Environ. Sci., 2020, 13, 2431 DOI: 10.1039/D0EE00477D

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